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Business Combinations Other Intangibles by Segment (Details) - USD ($) $ in Millions | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite-Lived Intangible Assets, Net | $ 671.2 |  |  |
Identifiable intangibles with indefinite useful lives | 49.9 |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 67.5 | $ 78.3 |  |
Adjustment for fully amortized intangibles | (35.2) | (46.0) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 1.8 | (1.0) |  |
Intangible Assets, Gross (Excluding Goodwill) | 1,382.1 | 1,335.6 | $ 1,348.0 | $ 1,304.3
Identified intangibles, with finite useful lives, accumulated amortization | (661.0) | (532.4) | (563.0) | (445.8)
Amortization expense | (132.1) | (132.9) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 35.2 | 46.0 |  |
Impact of exchange rate movements | (1.1) | 0.3 |  |
Net book value as of end of period | 721.1 | 803.2 | 785.0 |
Servicing Asset at Amortized Cost, Other than Temporary Impairments | 6.0 | 8.4 |  |
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract] |  |  |  |
Total | 671.2 |  |  |
Mortgage servicing rights [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 52.0 | 72.5 |  |
Adjustment for fully amortized intangibles | (25.3) | (25.7) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 0.0 | 0.0 |  |
Intangible Assets, Gross (Excluding Goodwill) | 828.5 | 794.1 | 801.8 | 747.3
Identified intangibles, with finite useful lives, accumulated amortization | (367.1) | (296.6) | (309.8) | (242.2)
Amortization expense | (82.6) | (80.1) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 25.3 | 25.7 |  |
Impact of exchange rate movements | 0.0 | 0.0 |  |
Net book value as of end of period | 461.4 | 497.5 |  |
Other Intangible Assets [Member] |  |  |  |
Schedule of Finite and Indefinite lived Intangible Assets by Segment [Line Items] |  |  |  |
Finite and Indefinite lived Intangible Assets, Additions | 15.5 | 5.8 |  |
Adjustment for fully amortized intangibles | (9.9) | (20.3) |  |
Finite And Indefinite Lived Intangible Assets Translation Adjustments | 1.8 | (1.0) |  |
Intangible Assets, Gross (Excluding Goodwill) | 553.6 | 541.5 | 546.2 | 557.0
Identified intangibles, with finite useful lives, accumulated amortization | (293.9) | (235.8) | $ (253.2) | $ (203.6)
Amortization expense | (49.5) | (52.8) |  |
Accumulated Amortization Adjustment for fully Amortized Intangibles | 9.9 | 20.3 |  |
Impact of exchange rate movements | (1.1) | 0.3 |  |
Net book value as of end of period | $ 259.7 | $ 305.7 |  |

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